(Reuters) - A strong earthquake centered off the coast of northeastern Japan shook buildings as far as Tokyo and led to a tsunami warning for coastal areas of the northeast, public broadcaster NHK said on Friday.

The earthquake had a preliminary magnitude of 7.3, the U.S. Geological Survey said. That was revised from an earlier estimate of 7.4.

TOKYO—A strong earthquake has jolted northeastern Japan and authorities have issued a warning of a possible tsunami.

The Japan Meteorological Agency says the earthquake with a preliminary magnitude of 7.3 struck in the Pacific Ocean off the coast of Miyagi prefecture at 5:18 p.m. (0818 GMT) Friday. The epicenter was 10 kilometers (6.2 miles) beneath the seabed.

The warning said the tsunami could be as high as 2 meters (2.19 yards).